source: GTP/trunk/Lib/Vis/Preprocessing/src/SamplingStrategy.h @ 1520

#ifndef _SamplingStategy_H__
#define _SamplingStategy_H__


namespace GtpVisibilityPreprocessor {


class Preprocessor;
struct SimpleRay;

/** This class generates a specific sampling strategy.
*/
class SamplingStrategy
{
 public:

         /** Sample rays of particular type
         */
         enum 
         {
                 OBJECT_BASED_DISTRIBUTION,
                 DIRECTION_BASED_DISTRIBUTION,
                 DIRECTION_BOX_BASED_DISTRIBUTION,
                 SPATIAL_BOX_BASED_DISTRIBUTION,
                 RSS_BASED_DISTRIBUTION,
                 RSS_SILHOUETTE_BASED_DISTRIBUTION,
                 VSS_BASED_DISTRIBUTION,
                 OBJECT_DIRECTION_BASED_DISTRIBUTION,
                 OBJECTS_INTERIOR_DISTRIBUTION
         };

         /** Default constructor
     */
         SamplingStrategy(const Preprocessor &preprocessor);

         virtual ~SamplingStrategy();

         /** Each strategy has to implement this function.
                 @returns true if generated valid sample.
         */
         virtual bool GenerateSample(SimpleRay &ray) const = 0;

protected:

        const Preprocessor &mPreprocessor;

};


class ObjectBasedDistribution: public SamplingStrategy
{
 public:
        
         ObjectBasedDistribution(const Preprocessor &preprocessor):
         SamplingStrategy(preprocessor) {}

         virtual bool GenerateSample(SimpleRay &ray) const;
};


class ObjectDirectionBasedDistribution: public SamplingStrategy
{
 public:
         ObjectDirectionBasedDistribution(const Preprocessor &preprocessor):
         SamplingStrategy(preprocessor) {}
        virtual bool GenerateSample(SimpleRay &ray) const;
};


class DirectionBasedDistribution: public SamplingStrategy
{
 public:
        DirectionBasedDistribution(const Preprocessor &preprocessor):
         SamplingStrategy(preprocessor) {}
        virtual bool GenerateSample(SimpleRay &ray) const;
};


class DirectionBoxBasedDistribution: public SamplingStrategy
{
 public:
         DirectionBoxBasedDistribution(const Preprocessor &preprocessor):
           SamplingStrategy(preprocessor) {}
           
           virtual bool GenerateSample(SimpleRay &ray) const;
};


class SpatialBoxBasedDistribution: public SamplingStrategy
{
 public:
         SpatialBoxBasedDistribution(const Preprocessor &preprocessor):
         SamplingStrategy(preprocessor) {}
         
         virtual bool GenerateSample(SimpleRay &ray) const;
};


/** This strategy generates samples inside of the objects, e.g.,
        for sampling the inside of a colon.
*/
/*class ObjectsInteriorDistribution: public SamplingStrategy
{
 public:
         ObjectsInteriorDistribution(const Preprocessor &preprocessor):
         SamplingStrategy(preprocessor) {}
         
         virtual bool GenerateSample(SimpleRay &ray) const;
};
*/
};

#endif